Malicious PDF — malware analysis report

Static analysis result for SHA-256 2683ba8732e32e99…

MALICIOUS

PDF

91.0 KB Created: 2021-07-14 04:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebcfb4de0ac7efe151bede34440c03db SHA-1: 87fe285720408d6e1e551254e1898132471e8662 SHA-256: 2683ba8732e32e9954262cb3ca81e19a95c8010fab71b99e1821fb50cd2958ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allmassage.net/upload/file/20210607063625.pdf
    • http://popnmusic.fr/userfiles/file/41162298612.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16089e37d0a74a---vepavakarusivuvanibomiwas.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/83d3688cb36da7c8e85eee9900d4b20f/mozarujutizilasuvo.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e92ab38d549---32809007550.pdf
    • https://esperanzadeavila.com/fotos/file/63888404522.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fjmdi5p3ilafjvc6a4lmajle1/9727272645.pdf
    • http://packamate.com/userfiles/radagiruzudeboxo.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e29b6f86---zajojoguvelovanuwiwus.pdf
    • https://nadinerogger.ch/userfiles/files/64713739686.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76d82cceda---26467151714.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc816ea775---83573995813.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9274ccacf---bipuvuraguvo.pdf
    • https://eletvital.hu/uploads/files/64855720358.pdf
    • https://baxsporthorses.nl/userfiles/file/bowuvenodakaligal.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hmau128elfj4be2d06pkb9t8v4/13611425539.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32db87b26e---84967491065.pdf
    • http://atut-biuro.com/uploaded/file/mowiniwuxe.pdf
    • http://munnarinfo.in/userfiles/file/57368887357.pdf
    • https://stijsr.com/userfiles/file/tifugadovu.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e864fc20b79ecd97b1d767c9c4889dfb/75183853460.pdf
    • http://2ds-creations.fr/userfiles/file/patukisabugaguzunoj.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/54798939ccc1fe5324793b35efefae5d/69652652744.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ofh6ccndo76cq76uii28q677k2/11207501633.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=black+hair+with+blond+roots
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001001d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 16792 bytes
font_01_sfnt_off00011834.bin
8545ed7bbd589cf5cde4c0834f5007e4a1aadb05e8a5937914b083a66cd4b5b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 10704 bytes
font_02_sfnt_off000130ca.bin
6d2062f3421e80c110a31e456c963829e124954f100935e20d7786f31cb1fd30
pdf-font-stream PDF embedded font (sfnt) at offset 0x130CA 17132 bytes